Why cant it be just "她 每天做" to say " she does it every day"?

why cant it be just “她 每天做” to say " she does it every day"?

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“The adverb 都 (dōu) is used to express “all” in Chinese. It’s common to use 都 (dōu) in a variety of sentences where it would seem unnecessary in English.”

also : Expressing "every" with "mei" - Chinese Grammar Wiki